Document 8VQVKvKEJ547ZGk4bDQZOMxDB

sm fir. fi.V.B. Hardy**" fir. fi.lt. Xivbu, toa*tnto.fihtBigil gaepinr 8t. Louis, Missouri Siptutir 20, 1955 fir. J.W. Stmtt London Your aaso Siptisbi; 8 to Mr. Nason iitOCLOR 10X20112 Howard Baton hat given no your aeao of September 8. Z will to happy to dltoutt this with fir. Bevaan during hit visit hart. 1 think, however, thr art ttvtral points that l ean answer you sow. You eoaatnt upon the difference in toxieity between Aroelor 125V and 1242. This it not particularly surprising because In the earlier work it was found that toxicity increased vlth chlorination. Of eourte, froa the standpoint of vol* utility in the ease of Inhalation or absorption froa the fut froa the point of view of ingestion ore isportafit. rankly, there was not too great o difference between the two eoapouade, however. Is you laow, the aaxlsus allowable concentrate is 0.1 al/cublc after in the ease of 1254, and as high as 10.0 aga in the case of 1268. 2 think the for&er is too low and the latter is too high. In this country they don't use the MJLCs eery routinely, but certainly in England 1 think it would be alright to consider 0.2 aga/eubie aeter aa perfectly cafe. * ' doing aore work. Vhat Is at that you want to prove? 2 belleee your vork should be directed towerde finding out vhat the concentrations are of iroelor during different operations .whether it JL industrial or painting, Ihe re ports you hats mu froa Battering Laboratory ere the re* xsoucit. of approximately 815,000 to 82.0,000 expenditure by HCC* position can be suaaerized'is this fashion. Vo taow Aroclors are toxic but the actual Halt baa net been pre cisely defined. 2t doe a not aake too such difference, it eeas to ae, because our aeln worry la whet will happen if an individual develop#! any type of liver disease and fives a history of Aroolor exposure. 2 aa sure the juries would not pay a great deal of attention to HiCs. i 57 \ TOWOLDMONOOQ1289 i ssa Uf 2 ftepteaber 20, 1955 iftocton tacieoi V, therefore, review ivirj new Arooior uee froft thla point of view. If It la an laduatrlal application where w# can fet air eoseaatratleaa tad hat* teat reasonable expectation that the air conoentratione will atay the eaae, wa art such aore liberal la tha ate of Arodor. If, however. It la dlatrlbated to householders where It can be need la alaoat aay ahape aad fora and ve are never able to know how such of the concentration they are expoaed to, ve art auoh aore atriot. Xo tcouat of toxlelty teatlnx will obviate thia laat dlleaaa and therefore 2 do not believe any aore teatin* would be justified. let*a aee what our dlaouaxlena with Dr. Xevsan and youraelf brln* out. mik X. Seaset Kelly, K.D 58 TOWOLDMON0001290